asterisk users - Oct 2011 - OT - SIP - Toggle to autoanswer after ringing

Hi,

Has anyone heard (or read) about an existing or emerging standard targeting
the following feature :
1. a SIP handset receives an incoming call
2. this handset starts ringing
3. then it receives an update asking to autoanswer the ringing call.

This feature would help to build software panels complementing or
replicating hard phones GUI.

(I know you can work around such feature using conference rooms or dealing
with hard phones API (really ?) but in order to keep Queue log accurate,
this feature would be useful).

Cheers
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